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I would start with exactly what you thought, the cap first.
You could be dribbling fluid from somewhere you would not notice i.e. a hose.
Maybe find a cheap pressure checker, and then check for bleed off.
White smoke would be indicative of a head leak. Bad side is I have seen some seep a little into the chamber which never showed until we did a pressure check of each cylinder.
Unless you have overheated your motor , I would not worry about the idea of a head leak. It seems that is less common.
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